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Maritime abbr. that predated SOS
Answer for the clue "Maritime abbr. that predated SOS ", 3 letters:
cqd
Word definitions for cqd in dictionaries
Wikipedia
Word definitions in Wikipedia
CQD , transmitted in Morse code as – · – · – – · – – · · is one of the first distress signals adopted for radio use. It was announced on 7 January 1904, by "Circular 57" of the Marconi International Marine Communication Company , and became effective, beginning ...